Details zur Publikation
|What is the role of individual species within bidirectional electroactive microbial biofilms: A case study on Desulfarculus baarsii and Desulfurivibrio alkaliphilus
|Izadi, P. ; Schröder, U.
|Bidirectional electron transfer; Desulfarculus baarsii; Desulfurivibrio alkaliphilus; Electrochemically active bacteria; Microbial electrochemistry
|Desulfarculus baarsii and Desulfurivibrio alkaliphilus are strictly anaerobic bacteria existing in marine sediments. D. baarsii gains energy through reducing sulphate and D. alkaliphilus is able to reduce elemental sulphur, thiosulphate and polysulphide in seawater. Both organisms were previously identified as key organisms in sediment derived, bidirectional electroactive biofilms. Here, we investigated the electrochemical performance of these two bacteria in bio-electrochemical systems and their possible involvement in anodic and cathodic reactions. The results show that D. baarsii was unable to donate or accept electrons to/from an electrode, while D. alkaliphilus was able to catalyse both anodic and cathodic reactions and interact with the electrode through direct or potentially indirect electron transfer. Raman spectra of D. alkaliphilus electrode biofilms showed a high similarity to Geobacter sulfurreducens biofilms, including the specific bands of cytochromes b and c, explaining the electroactivity of D. alkaliphilus in bioelectrochemical reactions.
|Izadi, P., Schröder, U. (2022):
What is the role of individual species within bidirectional electroactive microbial biofilms: A case study on Desulfarculus baarsii and Desulfurivibrio alkaliphilus
ChemElectroChem 9 (2), e202101116